What function does a router perform in a computer network?

A router primarily connects different networks and directs data traffic between them. It serves as a critical device that facilitates communication between different local area networks (LANs) or wide area networks (WANs). The router determines the best path for data packets to travel across these networks, ensuring they reach their destination efficiently.

In addition to directing traffic, routers often perform functions such as using routing protocols to determine the most efficient route and managing data packets as they move from various source networks to their destination networks.

The roles of other devices and functions in networking, such as connecting multiple devices within the same LAN or filtering network traffic, are typically performed by switches and firewalls, respectively, which are distinct from the core function of a router. This delineation helps in understanding the specific purpose that routers fulfill within network architecture.